BIOGRAPHICAL AND OTHER NOTICES, ALPHABETICALLY ARRANGED, RELATING TO EDWARD SOMERSET, SECOND MARQUIS OF WORCESTER, AND HIS IMMEDIATE FAMILY CONNECTIONS; WITH OCCASIONAL NOTES. "The present volume is, as it were, a supplement. [To. Mr. Dircks's _Life of the Marquis of Worcester_.] It contains what the French call 'pièces justificatives,' on which that biography was founded; and such other materials connected with the history of Lord Worcester's family and his invention of the steam-engine as will prevent, as far as possible, a repetition of the gross errors hitherto promulgated on these subjects." _Notes and Queries_, February 3, 1866. * * * * * One Volume, post 8vo., with 130 wood engravings, price 10_s_ 6_d_, PERPETUUM MOBILE; OR, HISTORY OF THE SEARCH FOR SELF-MOTIVE POWER DURING THE 17TH, 18TH, AND 19TH CENTURIES, WITH AN INTRODUCTORY ESSAY. "The literature of this subject [Perpetual Motion] is very extensive, but scattered mainly through Patent Records and ephemeral pamphlets. We would especially refer the curious reader to a recent work by Mr. Dircks, entitled _Perpetuum Mobile_, to which we have been indebted for historical notices. It is extremely complete and interesting as a history." _Chambers's Encyclopædia_, Part 15, 1865. "A very useful collection on the history of the attempts at perpetual motion, that is, of obtaining the consequences of power without any power to produce them."--_Professor De Morgan's_ Budget of Paradoxes, No. 28.--_Athenæum_, July 15, 1865. * * * * * One Volume, post 8vo., with portrait, price 3_s_ 6_d_, CONTRIBUTION TOWARDS A HISTORY OF ELECTRO-METALLURGY, ESTABLISHING THE ORIGIN OF THE ART. "In his Introduction, Mr. Dircks has clearly stated the claims of invention, and fairly discussed the only just grounds that can give claim to priority of invention."--_The Mining Journal_, February 7, 1863. "In the collection of chronological and other data for the history of various branches and application of science, Mr. Dircks appears to be indefatigable."--_The Electrician_, February 27. "It is a useful and clear digest of evidence, and apparently impartially put together."--_The Practical Mechanics' Journal_ (_Glasgow_), July. * * * * * One Volume, post 8vo., with two portraits, price 4_s_, INVENTORS AND INVENTIONS, IN THREE PARTS.